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See https://meta.discourse.org/t/discourse-email-messages-are-incorrectly-threaded/233499 for thorough reasoning. This commit changes how we generate Message-IDs and do email threading for emails sent from Discourse. The main changes are as follows: * Introduce an outbound_message_id column on Post that is either a) filled with a Discourse-generated Message-ID the first time that post is used for an outbound email or b) filled with an original Message-ID from an external mail client or service if the post was created from an incoming email. * Change Discourse-generated Message-IDs to be more consistent and static, in the format `discourse/post/:post_id@:host` * Do not send References or In-Reply-To headers for emails sent for the OP of topics. * Make sure that In-Reply-To is filled with either a) the OP's Message-ID if the post is not a direct reply or b) the parent post's Message-ID * Make sure that In-Reply-To has all referenced post's Message-IDs * Make sure that References is filled with a chain of Message-IDs from the OP down to the parent post of the new post. We also are keeping X-Discourse-Post-Id and X-Discourse-Topic-Id, headers that we previously removed, for easier visual debugging of outbound emails. Finally, we backfill the `outbound_message_id` for posts that have a linked `IncomingEmail` record, using the `message_id` of that record. We do not need to do that for posts that don't have an incoming email since they are backfilled at runtime if `outbound_message_id` is missing. |
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